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词汇 noise and number index
释义

Definition of noise and number index in English:

noise and number index

noun
  • A quantity used in evaluating aircraft noise in terms of its intensity and frequency of occurrence; abbreviated NNI.

Origin

1960s.

Definition of noise and number index in US English:

noise and number index

noun
  • A quantity used in evaluating aircraft noise in terms of its intensity and frequency of occurrence; abbreviated NNI.

Origin

1960s.

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